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How do I expand function calls in a string?

Jasmine
Administrator

Jan 19, 2001, 2:45 PM

Post #1 of 1 (2859 views)

How do I expand function calls in a string?	Can't Post

(From the Perl FAQ)

How do I expand function calls in a string?

This is documented in the perlref manpage. In general, this is fraught with quoting and readability problems, but it is possible. To interpolate a subroutine call (in list context) into a string:

Code

    print "My sub returned @{[mysub(1,2,3)]} that time.\n";

If you prefer scalar context, similar chicanery is also useful for arbitrary expressions:

Code

    print "That yields ${\($n + 5)} widgets\n";

Version 5.004 of Perl had a bug that gave list context to the expression in ${...}, but this is fixed in version 5.005.

See also ``How can I expand variables in text strings?'' .

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